Language Translator in Offline Mode

I want to convert Arabic language with in a text file to English language. Our application is developed in .net with c# .  Our server will be in offline mode and hence require translation in offline mode. Hence I want a dll to do the translation  into our web application  without internet connectivity.We want a trial version to test as such   and would like to purchase if  it suits our needs. Can SDL help us in this regard?